After reading about memory upgrades online, I tried my own, thanks to a Christmas gift from Dad. Went from one 4GB stick, default Samsung stick installed in the Lenovo x230, to Kingston HyperX 2x4GB.
+1.6 in Memory
+1.7 in Desktop 2D Graphics
.3 in Gaming 3D Graphics
I called Kingston and they confirmed that if you multiply (dual channel) DRAM Frequency by two, you have the total RAM Speed, which is 1863.6 for me (1866 advertised).